204  
FNUS74 KHUN 231156  
FWSHUN  
 
SPOT FORECAST FOR GRINDSTONE/WILBURN FORD...USFS  
NATIONAL WEATHER SERVICE HUNTSVILLE AL  
656 AM CDT THU MAR 23 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 0900 CDT ON MARCH 23.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
DRY WEATHER IS FORECAST TO CONTINUE AT THE BURN AREA TODAY INTO  
FRIDAY EVENING, AS AN AREA OF SURFACE HIGH PRESSURE OFF OF THE EAST  
COAST BRINGS A SOUTHEAST TO SOUTH FLOW ACROSS THE REGION. DAYTIME  
HIGH TEMPERATURES DESPITE INCREASING CLOUDS SHOULD WARM INTO THE  
LOWER 70S, WITH MINIMUM AFTERNOON RELATIVE HUMIDITIES AROUND 42  
PERCENT. LIGHT WINDS AT DAYBREAK WILL BECOME SE 5-7 MPH FROM THE  
MID MORNING INTO THE LATE AFTERNOON. GENERALLY GOOD SMOKE DISPERSION  
RATES ARE FORECAST, WITH TRANSPORT WINDS FROM THE SOUTH AROUND 13  
MPH AND MIXING HEIGHTS AROUND 5100 FEET ABOVE GROUND LEVEL.  
 
MOSTLY CLOUDY SKIES AND MILDER CONDITIONS ARE FORECAST TONIGHT,  
WITH NIGHT TIME LOWS COOLING INTO THE MID 50S AND MAXIMUM RELATIVE  
HUMIDITY LEVELS AROUND 84 PERCENT. SOUTHEAST WINDS IN THE 5-7 MPH  
RANGE WILL KEEP LVORI VALUES (FOG POTENTIAL) LOW. DRY AND CONTINUED  
WARM WEATHER IS FORECAST ON FRIDAY, WITH HIGHS WARMING INTO THE  
LOWER 70S AND MINIMUM RELATIVE HUMIDITY VALUES AROUND 50 PERCENT.  
RAIN CHANCES RETURN MAINLY AFTER MIDNIGHT FRIDAY NIGHT AS THE  
STORM SYSTEM TO THE WEST BEGINS TO AFFECT THE AREA.  
 
   
TODAY
 
 
SKY/WEATHER.........PARTLY SUNNY (50-60 PERCENT).  
MAX TEMPERATURE.....AROUND 73.  
MIN HUMIDITY........42 PERCENT.  
WIND (20 FT)........LIGHT WINDS...BECOMING SOUTHEAST 5 TO 7 MPH IN  
THE LATE MORNING AND AFTERNOON.  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
LAL.................1.  
MIXING HEIGHT.......300-2200 FT AGL...INCREASING TO 3100-5000 FT  
AGL IN THE AFTERNOON.  
TRANSPORT WINDS.....SOUTH 6 TO 15 MPH...BECOMING SOUTHEAST AROUND  
16 MPH LATE.  
LVORI...............2.  
 
TIME (CDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........MC MC MC MC MC MC MC MC MC  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............53 58 62 65 69 70 72 73 72  
RH..............59 53 50 48 45 45 42 43 44  
20 FT WIND DIR..130 140 140 150 150 150 150 150 150  
20 FT WIND SPD..5 6 7 7 7 7 7 7 7  
20 FT WIND GUST.10 10 10 10 10 10 10 10 10  
MIX HGT (KFT)...1.0 1.5 2.2 3.1 3.9 4.6 5.0 5.0 4.2  
TRANSP WIND DIR.140 150 160 160 160 160 160 160 150  
TRANSP WIND SPD.13 15 15 15 14 14 14 14 16  
DISPERSION IDX..8 10 31 36 38 41 42 42 45  
LVORI...........3 2 2 2 1 1 1 1 1  
CWR.............0 0 0 0 0 0 0 0 0  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0  
LAL.............1 1 1 1 1 1 1 1 1  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT).  
MIN TEMPERATURE.....AROUND 54.  
MAX HUMIDITY........83 PERCENT.  
WIND (20 FT)........SOUTHEAST WINDS 6 TO 7 MPH.  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
LAL.................1.  
MIXING HEIGHT.......1400-3000 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 18 TO 21 MPH.  
LVORI...............2.  
 
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........MC MC MC MC MC MC MC MC MC MC MC MC  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............71 69 66 64 62 61 59 59 57 56 55 55  
RH..............46 49 54 56 60 62 64 64 69 74 77 77  
20 FT WIND DIR..140 140 140 140 140 150 150 150 150 150 150 150  
20 FT WIND SPD..6 6 6 7 7 7 7 7 7 7 7 7  
20 FT WIND GUST.10 10 10 10 10 10 10 10 10 10 10 10  
MIX HGT (KFT)...3.0 2.0 1.7 1.7 1.7 1.7 1.6 1.6 1.5 1.4 1.4 1.4  
TRANSP WIND DIR.150 140 140 150 150 150 150 150 150 150 150 150  
TRANSP WIND SPD.18 20 20 18 18 20 20 21 21 21 21 21  
DISPERSION IDX..44 37 34 32 33 34 22 23 23 23 23 23  
LVORI...........1 1 1 1 2 2 2 3 3 3 3 3  
CWR.............0 0 0 0 0 0 0 0 0 0 0 0  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
   
FRIDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT).  
MAX TEMPERATURE.....AROUND 73.  
MIN HUMIDITY........51 PERCENT.  
WIND (20 FT)........SOUTH WINDS 7 TO 8 MPH.  
CWR.................10 PERCENT.  
CHANCE OF PCPN......10 PERCENT.  
LAL.................1.  
MIXING HEIGHT.......1300-2300 FT AGL.  
TRANSPORT WINDS.....SOUTH 17 TO 21 MPH.  
LVORI...............2.  
 
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........MC MC MC MC MC MC MC MC MC MC MC MC  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............54 54 56 60 63 66 68 70 72 73 73 73  
RH..............83 83 80 69 65 61 57 55 53 51 51 51  
20 FT WIND DIR..150 150 150 160 160 160 160 170 170 160 160 160  
20 FT WIND SPD..7 7 7 8 8 8 8 8 8 8 8 8  
20 FT WIND GUST.10 10 10 15 15 15 15 15 15 15 15 15  
MIX HGT (KFT)...1.3 1.3 1.4 1.4 1.5 1.6 1.7 1.8 1.9 2.1 2.1 2.3  
TRANSP WIND DIR.160 160 160 150 150 160 160 160 160 160 160 160  
TRANSP WIND SPD.21 21 21 20 20 20 18 18 17 17 17 20  
DISPERSION IDX..23 23 23 22 22 33 32 34 33 34 35 40  
LVORI...........3 3 3 3 2 2 2 1 1 1 1 1  
CWR.............0 10 10 10 10 10 10 10 10 10 10 10  
CHC OF PCPN (%).0 10 10 10 10 10 10 10 10 10 10 10  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
 

 
FORECASTER...BOYD  
REQUESTED BY...KERRY  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1705014.0/HUN  
.EMAIL KERRYCLARK@FS.FED.US  
 
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